'use strict';

// Do this as the first thing so that any code reading it knows the right env.
process.env.BABEL_ENV = 'development';
process.env.NODE_ENV = 'development';

// Makes the script crash on unhandled rejections instead of silently
// ignoring them. In the future, promise rejections that are not handled will
// terminate the Node.js process with a non-zero exit code.
process.on('unhandledRejection', err => {
  throw err;
});

// Ensure environment variables are read.
require('../config/env');

const fs = require('fs');
const chalk = require('react-dev-utils/chalk');
const webpack = require('webpack');
const WebpackDevServer = require('webpack-dev-server');
const clearConsole = require('react-dev-utils/clearConsole');
const {
  choosePort,
  createCompiler,
  prepareProxy,
  prepareUrls
} = require('react-dev-utils/WebpackDevServerUtils');
const openBrowser = require('react-dev-utils/openBrowser');
const paths = require('../config/paths');
const configFactory = require('../config/webpack.config');
const createDevServerConfig = require('../config/webpackDevServer.config');

const useYarn = fs.existsSync(paths.yarnLockFile);
const isInteractive = process.stdout.isTTY;

function startRenderer() {
  return new Promise((resolve, reject) => {
    const DEFAULT_PORT = parseInt(process.env.PORT, 10) || 3000;
    const HOST = process.env.HOST || '0.0.0.0';

    if (process.env.HOST) {
      console.log(
        chalk.cyan(
          `Attempting to bind to HOST environment variable: ${chalk.yellow(
            chalk.bold(process.env.HOST)
          )}`
        )
      );
      console.log(
        `If this was unintentional, check that you haven't mistakenly set it in your shell.`
      );
      console.log(
        `Learn more here: ${chalk.yellow('https://bit.ly/CRA-advanced-config')}`
      );
      console.log();
    }

    // We require that you explicitly set browsers and do not fall back to
    // browserslist defaults.
    const { checkBrowsers } = require('react-dev-utils/browsersHelper');
    checkBrowsers(paths.appPath, isInteractive)
      .then(() => {
        // We attempt to use the default port but if it is busy, we offer the user to
        // run on a different port. `choosePort()` Promise resolves to the next free port.
        return choosePort(HOST, DEFAULT_PORT);
      })
      .then(port => {
        if (port == null) {
          reject('We have not found a port.');
        }
        const config = configFactory('development');
        const protocol = process.env.HTTPS === 'true' ? 'https' : 'http';
        const appName = require(paths.appPackageJson).name;
        const useTypeScript = fs.existsSync(paths.appTsConfig);
        const tscCompileOnError = process.env.TSC_COMPILE_ON_ERROR === 'true';
        const urls = prepareUrls(protocol, HOST, port);
        const devSocket = {
          warnings: warnings =>
            devServer.sockWrite(devServer.sockets, 'warnings', warnings),
          errors: errors =>
            devServer.sockWrite(devServer.sockets, 'errors', errors)
        };
        // Create a webpack compiler that is configured with custom messages.
        const compiler = createCompiler({
          appName,
          config,
          devSocket,
          urls,
          useYarn,
          useTypeScript,
          tscCompileOnError,
          webpack
        });
        // Load proxy config
        const proxySetting = require(paths.appPackageJson).proxy;
        const proxyConfig = prepareProxy(proxySetting, paths.appPublic);
        // Serve webpack assets generated by the compiler over a web server.
        const serverConfig = createDevServerConfig(
          proxyConfig,
          urls.lanUrlForConfig
        );
        const devServer = new WebpackDevServer(compiler, serverConfig);
        // Launch WebpackDevServer.
        devServer.listen(port, HOST, err => {
          if (err) {
            //TODO
            return console.log(err);
            reject(err);
          }
          if (isInteractive) {
            // clearConsole();
          }

          // We used to support resolving modules according to `NODE_PATH`.
          // This now has been deprecated in favor of jsconfig/tsconfig.json
          // This lets you use absolute paths in imports inside large monorepos:
          if (process.env.NODE_PATH) {
            console.log(
              chalk.yellow(
                'Setting NODE_PATH to resolve modules absolutely has been deprecated in favor of setting baseUrl in jsconfig.json (or tsconfig.json if you are using TypeScript) and will be removed in a future major release of create-react-app.'
              )
            );
            console.log();
          }

          console.log(chalk.cyan('Starting the development server...\n'));
          resolve();
        });
      })
      .catch(err => {
        reject(err);
      });
  });
}

module.exports = { startRenderer };
